/Engine/Source/Runtime/Slate/Public/Framework/Text/CharRangeList.h
Represents a range of characters, specified by the Unicode code point of the first and last characters in the range, both included. If you need a single-character range, simply use the same character for both the first and last characters.
struct FCharRange
uint16
First
Unicode code point of the first character in the range (inclusive).
uint16
Last
Unicode code point of the last character in the range (inclusive).